Steps to remove the Front Bottom Cover:

1. Place the printer on its front
For easy access to the bottom section of the A1, you need to place the printer on the front. 
Start by flipping the screen on its side, then gently place the printer on its front, as shown in the image below. 
Use a box of filament to keep the top side raised to avoid putting pressure on the extruder and the screen.

2. Remove the printer's bottom cover
Remove the 10 screws marked in red to prepare the bottom housing removal. 
Please note that the screw marked in yellow needs to be loosened, but it will not be possible to remove it. It remains attached to the cable bracket.

3. Disconnect the wires and remove the wire bracket
In the next step, the Camera, Motor X and Motor Z cables need to be disconnected. 
Then, you will be able to simply push the plastic wire bracket upwards, to disconnect the USB cable.
Important
If you cannot easily remove the wire bracket, make sure the screw holding it in place (labeled with Nr. 11 in the previous step) is loosened
After removing the wires, gently pry out the plastic bottom cover.